[PATCH] ->compat_ioctl for 390 tape_char

The only own ioctl, TAPE390_DISPLAY, is compat_clean, everything else is
routed through common translation code.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/s390/kernel/compat_ioctl.c

@@ -63,8 +63,6 @@ COMPATIBLE_IOCTL(BIODASDSATTR)
 COMPATIBLE_IOCTL(BIODASDCMFENABLE)
 COMPATIBLE_IOCTL(BIODASDCMFDISABLE)
 COMPATIBLE_IOCTL(BIODASDREADALLCMB)
-
-COMPATIBLE_IOCTL(TAPE390_DISPLAY)
 };
 
 int ioctl_table_size = ARRAY_SIZE(ioctl_start);

drivers/s390/char/tape_char.c

@@ -37,6 +37,8 @@ static int tapechar_open(struct inode *,struct file *);
 static int tapechar_release(struct inode *,struct file *);
 static int tapechar_ioctl(struct inode *, struct file *, unsigned int,
 			  unsigned long);
+static long tapechar_compat_ioctl(struct file *, unsigned int,
+			  unsigned long);
 
 static struct file_operations tape_fops =
 {
@@ -44,6 +46,7 @@ static struct file_operations tape_fops =
 	.read = tapechar_read,
 	.write = tapechar_write,
 	.ioctl = tapechar_ioctl,
+	.compat_ioctl = tapechar_compat_ioctl,
 	.open = tapechar_open,
 	.release = tapechar_release,
 };
@@ -463,6 +466,23 @@ tapechar_ioctl(struct inode *inp, struct file *filp,
 	return device->discipline->ioctl_fn(device, no, data);
 }
 
+static long
+tapechar_compat_ioctl(struct file *filp, unsigned int no, unsigned long data)
+{
+	struct tape_device *device = filp->private_data;
+	int rval = -ENOIOCTLCMD;
+
+	if (device->discipline->ioctl_fn) {
+		lock_kernel();
+		rval = device->discipline->ioctl_fn(device, no, data);
+		unlock_kernel();
+		if (rval == -EINVAL)
+			rval = -ENOIOCTLCMD;
+	}
+
+	return rval;
+}
+
 /*
  * Initialize character device frontend.
  */